package com.softstao.softstaolibrary.library.activity;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;

import com.softstao.softstaolibrary.R;
import com.softstao.softstaolibrary.library.fragment.ImageDetailFragment;
import com.softstao.softstaolibrary.library.widget.HackyViewPager;

import java.util.ArrayList;

/**
 * Created by win7 on 2017/2/24.
 */
public class ImagePagerActivity extends FragmentActivity {
    private static final String STATE_POSITION = "STATE_POSITION";
    public static final String EXTRA_IMAGE_INDEX = "image_index";
    public static final String EXTRA_IMAGE_URLS = "image_urls";

    private HackyViewPager mPager;
    private int pagerPosition;
    private LinearLayout viewGroup;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.image_detail_pager);

        pagerPosition = getIntent().getIntExtra(EXTRA_IMAGE_INDEX, 0);
        ArrayList<String> urls = getIntent().getStringArrayListExtra(
                EXTRA_IMAGE_URLS);

        ImageView back = (ImageView) findViewById(R.id.back_btn);
        back.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                onBackPressed();
            }
        });
        mPager = (HackyViewPager) findViewById(R.id.pager);
        ImagePagerAdapter mAdapter = new ImagePagerAdapter(getSupportFragmentManager(), urls);
        mPager.setAdapter(mAdapter);
        viewGroup = (LinearLayout) findViewById(R.id.viewGroup);

        // 更新下标
        mPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

            @Override
            public void onPageScrollStateChanged(int arg0) {
            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {
            }

            @Override
            public void onPageSelected(int arg0) {
            }

        });
        if (savedInstanceState != null) {
            pagerPosition = savedInstanceState.getInt(STATE_POSITION);
        }

        mPager.setCurrentItem(pagerPosition);
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        outState.putInt(STATE_POSITION, mPager.getCurrentItem());
    }

    private class ImagePagerAdapter extends FragmentStatePagerAdapter {

        public ArrayList<String> fileList;

        public ImagePagerAdapter(FragmentManager fm, ArrayList<String> fileList) {
            super(fm);
            this.fileList = fileList;
        }

        @Override
        public int getCount() {
            return fileList == null ? 0 : fileList.size();
        }

        @Override
        public Fragment getItem(int position) {
            String url = fileList.get(position);
            return ImageDetailFragment.newInstance(url);
        }

    }
}
